安装pophelper

按照网上的教程安装依赖包：
# install the dependency packages
install.packages(c("devtools","ggplot2","gridExtra","gtable","label.switching","tidyr"),dependencies=T)

发现安装devtools包时报错，提示gert包配置错误ERROR: configuration failed for package ‘gert’，进一步研究报错发现是缺少libgit2
所以用conda安装libgit2：
conda activate R
conda install libgit2
R
>install.packages("gert")
>install.packages("usethis")
然后重新安装dectools在内的依赖包：

install.packages(c("devtools","ggplot2","gridExtra","gtable","label.switching","tidyr"),dependencies=T)

没报错了，然后安装pophelper：

# install pophelper package from GitHub 
devtools::install_github('royfrancis/pophelper')